. >>> in rome, long delayed restoration is revealing things never thought. the remnants of unexpected red, black and blue frescoes and there's graffiti. the more recent graffiti is from the 1800s and 1943. >>> san francisco police are taking a new approach in the fight against graffiti as ktvu david stevenson says the problem may not be coming from the people you expect. >> really important when we do mural art that we're response sieve to the phaoupbty. >> reporter: san francisco's art commission today showed -- responsive to the community. >> reporter: san francisco's art commission today showed us how they're using art to avoid graffiti. only a small percentage of the tagging in the city is gang related and that there's more than 250 graffiti related arrests each year. >> it's right after the giant's won the world series this year we had an explosion of graffiti late october early november. >> san francisco's department of public works says it's seen a slow decline in graffiti. others say community murals once left alone by taggers are now increasingly un